<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 区域 -->
    <el-card>
      <!-- 提示区 -->
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false"
      >
      </el-alert>
      <!--步骤条区域   -->
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <el-form
        label-postition="top"
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <!-- Tabs栏 -->
        <el-tabs
          v-model="activeIndex"
          :tab-position="'left'"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <!-- 切记顺序 form->Tabs->Tabs-pane -->
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <!-- v-model当选中内容后 将其ID 填入到数组中 -->
              <el-cascader
                v-model="addForm.goods_cat"
                :options="catelist"
                :props="cateProps"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!--渲染表单的item项  -->
            <el-form-item
              :label="item.attr_name"
              v-for="item in manyTableData"
              :key="item.attr_id"
            >
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  :label="cb"
                  v-for="(cb, i) in item.attr_vals"
                  :key="i"
                  border
                >
                </el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item
              :label="item.attr_name"
              v-for="item in onlyTableData"
              :key="item.attr_id"
            >
              <br />
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action 图片上传的后台API地址 list-type组件呈现方式 -->
            <!-- 如果 :action="load" 则会将其发送到http://localhost:9000/#/goods/add/load -->
            <!-- 没有header 包裹token 让upload底层的ajax发送过去 会导致 无效token 被后端拒绝接收 -->
            <!-- 除了登录功能以外 每一个功能都需要是有权限的 而这个没有token的方式 就会无效 -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="hearderObj"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <!-- 富文本编辑器  -->

          <el-tab-pane label="商品内容" name="4">
            <quill-editor v-model="addForm.goods_introduce"> </quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="btnAdd" @click="add"
              >添加商品</el-button
            >
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="" class="previewImg" />
    </el-dialog>
  </div>
</template>
<script>
import _ from "lodash";
export default {
  data() {
    return {
      activeIndex: "0",
      //   商品分类列表
      catelist: [],
      //   添加表单的数据对象
      addForm: {
        goods_name: "",
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详情描述
        goods_introduce: "",
        attrs: [],
      },
      addFormRules: {
        goods_name: [
          {
            required: true,
            message: "请输入商品名称",
            trigger: "blur",
          },
        ],
        goods_price: [
          {
            required: true,
            message: "请输入商品价格",
            trigger: "blur",
          },
        ],
        goods_weight: [
          {
            required: true,
            message: "请输入商品重量",
            trigger: "blur",
          },
        ],
        goods_number: [
          {
            required: true,
            message: "请输入商品数量",
            trigger: "blur",
          },
        ],
        goods_cat: [
          {
            required: true,
            message: "请选择商品分类",
            trigger: "blur",
          },
        ],
      },
      cateProps: {
        label: "cat_name", //看见的
        value: "cat_id", //选中之后 实际的值(id)存入到双向数据绑定的goods_cat: [],
        children: "children", //级联 数据中的哪一个
        expandTrigger: "hover",
      },
      // 动态参数列表数据
      manyTableData: [],
      onlyTableData: [],
      // 上传图片的URL地址
      uploadURL: "http://127.0.0.1:8888/api/private/v1/upload",
      //图片上传组件的请求头 为每一次上传的ajax 请求上传了一个token认证

      hearderObj: {
        Authorization: window.sessionStorage.getItem("token"),
      },
      previewPath: "",
      previewVisible: false,
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //   获取所有商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status != 200) {
        return this.$message.error("获取商品分类数据失败");
      }
      this.catelist = res.data;
    },
    // 级联选择器 选中项变化触发函数
    handleChange() {
      console.log(this.addForm.goods_cat);
      if (this.addForm.goods_cat.length != 3) {
        this.addForm.goods_cat = [];
      }
    },
    // 只要触发了标签页的切换 就会立即打印出 对应的name值
    beforeTabLeave(activeName, oldActiveName) {
      //   console.log("即将离开的标签页名字是" + oldActiveName + "即将进入"+activeName);
      if (oldActiveName === "0" && this.addForm.goods_cat.length != 3) {
        this.$message.error("请先选择商品分类!");
        return false; //不允许切换
      }
    },
    //在触发标签页的跳转的时候 会触发
    async tabClicked() {
      // 证明访问的是 动态参数面板
      if (this.activeIndex === "1") {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: "many" },
          }
        );
        if (res.meta.status !== 200) {
          console.log(res.meta.status);
          return this.$message.error("获取动态参数列表失败!");
        }
        res.data.forEach((item) => {
          item.attr_vals = //每一项item 都从字符串变成了数组
            item.attr_vals.length === 0
              ? [] //如果attr_vals的数据为空 就分割成空数组
              : item.attr_vals.split(" ");
        });
        console.log(res.data);
        this.manyTableData = res.data;
      } else if (this.activeIndex === "2") {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: "only" },
          }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("获取静态属性失败!");
        }
        this.onlyTableData = res.data;
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      console.log(file);
      this.previewPath = file.response.data.url;
      this.previewVisible = true;
    },
    // 处理移除图片的操作
    handleRemove(file) {
      // 获取将要删除的图片的临时路径
      const filepath = file.response.data.tmp_path;
      // 从pics数组中  找到这个图片的索引值
      const i = this.addForm.pics.findIndex((x) => {
        x.pic === filepath;
      });
      // 调用数组的splice 方法 把图片信息对象 从splice中移除
      this.addForm.pics.splice(i, 1);
      console.log(this.addForm);
    },
    // 监听图片上传成功的事件 在pics中添加数组
    handleSuccess(response) {
      console.log(response);
      // 1.拼接得到一个图片信息对象 有格式要求 所以这样写
      const picInfo = { pic: response.data.tmp_path };
      // 2.将图片信息对象 push到数组中
      this.addForm.pics.push(picInfo);
    },
    // 添加商品
    add() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) {
          return this.$message.error("请填写必要的表单项目");
        }
        // item.attr_vals 是这个item 动态参数里面的 标签数组 (数据:黑色和白色)
        // 执行添加的业务逻辑因为在级联选择器的双向绑定里要求这个分类列表是数组
        // 但是这个要求是 字符串 所以要进行深拷贝(lodash) cloneDeep(obj)
        const form = _.cloneDeep(this.addForm);
        form.goods_cat = form.goods_cat.join(",");
        console.log(form.goods_cat);
        // 处理动态参数
        this.manyTableData.forEach((item) => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(" "),
          };
          this.addForm.attrs.push(newInfo);
        });
        // 处理静态属性
        this.onlyTableData.forEach((item) => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals,
          };
          this.addForm.attrs.push(newInfo);
        });
        form.attrs = this.addForm.attrs;
        console.log(form);

        // 发起添加商品的请求
        // 商品的名称 必须是唯一的
        const { data: res } = await this.$http.post("goods", form);
        if (res.meta.status !== 201) {
          return this.$message.error("添加商品失败!");
        }
        this.$message.success("添加商品成功!");
        this.$router.push("/goods");
      });
    },
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2];
      }
      return null;
    },
  },
};
</script>
<style  lang='less' scoped>
.el-steps {
  margin-top: 20px;
}
.el-steps {
  margin: 15px 0;
}
.el-step_title {
  font-size: 13px;
}
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
/deep/ .el-form-item__label {
  padding: 0px;
  text-align: left;
}

/deep/.el-form-item__content {
  margin: 0 !important;
  line-height: 0px;
}
/deep/.el-form-item__label {
  width: 120px !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>